Autor según el artículo: Silvia De la Flor; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra
Departamento: Química Analítica i Química Orgànica Enginyeria Mecànica
Autor/es de la URV: DE LA FLOR LOPEZ, SILVIA; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra
Palabras clave: Dual-curing Rheological analysis Thiol-epoxy
Resumen: An extensive characterization of a sequential dual-curing system based on off-stoichiometric “thiol-epoxy” mixtures was carried out using thiol compounds of different functionality. The intermediate and final materials obtained after each curing stages at different thiol-epoxy ratios were studied by means of thermomechanical and rheological experiments. The storage and loss modulus and the loss factor tan δ were monitored during the curing process to analyse gelation and network structure build-up. The critical ratio for gelation was determined making use of the ideal Flory-Stockmayer theory and compared with experimental results. Intermediate materials obtained in the vicinity of the theoretical critical ratio did not have the mechanical consistency expected for partially crosslinked materials, did not retain their shape and even experienced undesired flow upon heating to activate the second curing reaction. The rheological results showed that the critical ratio is higher than the predicted value and that a softening during the second curing stage affects the shape-retention at this ratio. From the thermomechanical results, a wide range of intermediate and final materials with different properties and applicability can be obtained by properly choosing the thiol-epoxy ratio: from liquid-like to highly deformable intermediate materials and from moderately crosslinked (deformable) to highly crosslinked (brittle) final materials.
Grupo de investigación: Grup d'Investigació en Enginyeria Computacional i Experimental
Áreas temáticas: Enginyeria mecànica Ingeniería mecánica Mechanical engineering
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 0261-3069
Identificador del autor: 0000-0002-6851-1371; n/a; 0000-0002-3492-2922; 0000-0003-1387-0358
Fecha de alta del registro: 2016-11-02
Página final: 127
Volumen de revista: 113
Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2017
Página inicial: 116
Tipo de publicación: Article Artículo Article
Repositori URV